A110013 Squares of the form 4p + 5, where p is a prime.

25, 49, 81, 121, 169, 289, 361, 441, 529, 729, 961, 1089, 1521, 1681, 1849, 2401, 2809, 3249, 3721, 3969, 5041, 5929, 6241, 6889, 7921, 8281, 8649, 9409, 10201, 11449, 11881, 12321, 12769, 14161, 14641, 16641, 17161, 17689, 18769, 19881, 23409

Offset

1,1

Comments

The sequence contain all squares of greater of twin primes.

Links

Amiram Eldar, Table of n, a(n) for n = 1..10000

Formula

a(n) = 4*A002327(n) + 5 = A088502(n)^2.

Mathematica

Select[4#+5&/@Prime[Range[900]], IntegerQ[Sqrt[#]]&]  (* Harvey P. Dale, Jan 29 2011 *)

Crossrefs

Cf. A002327, A002328, A088502.

Cf. A108604.

Sequence in context: A324871 A241836 A110484 * A109861 A348754 A106564

Adjacent sequences: A110010 A110011 A110012 * A110014 A110015 A110016

Keyword

easy,nonn

Author

Giovanni Teofilatto, Sep 03 2005

Extensions

Corrected and extended by Ray Chandler, Sep 04 2005

Status

approved